Skip to content

Time-of-Use Rates and Peak Shaving: What They Mean for Your Energy Bill

  • by
Save money by using power from battery at the right time


Understanding your energy bill has become more complex but potentially more advantageous than ever before, thanks to new pricing structures and technologies like Time-of-Use (ToU) rates and peak shaving strategies. These innovations can help you gain greater control over your energy costs, but they require a nuanced understanding of when and how you use electricity. This article will demystify Time-of-Use rates and peak shaving, providing you with actionable insights on how you can optimize your energy consumption for financial benefits.

What are Time-of-Use (ToU) Rates?

Traditional flat-rate billing charges consumers a single rate for electricity, regardless of the time of day it is consumed. In contrast, Time-of-Use (ToU) rates fluctuate based on the demand for electricity at different times. These rates are generally broken down into three categories:

  • Off-Peak: These are the hours when electricity demand is lowest, typically late at night and early in the morning. Rates during off-peak hours are significantly cheaper.
  • Mid-Peak: This is the intermediate stage where rates are higher than off-peak but lower than peak rates.
  • Peak: These are the hours when electricity demand is highest, usually during weekday evenings. Rates during peak hours can be much more expensive.

Why Do Utilities Offer ToU Rates?

Utilities have varying costs to generate or purchase electricity based on demand. During high-demand periods, utilities often have to rely on more expensive and less efficient “peaker” power plants. By incentivizing consumers to shift their consumption to off-peak hours, utilities can reduce the need for these costly, less-efficient forms of electricity generation.

Peak Shaving: A Strategy for Savings

Peak shaving refers to the strategic reduction of electrical consumption during periods of high demand. Essentially, it’s a way to “shave off” some of the peak demand, which not only helps the grid but can also lower your energy bill if you’re on a ToU rate plan. Peak shaving strategies include:

  • Shifting Usage: The most straightforward peak shaving technique is simply moving high-energy activities to off-peak hours. For instance, run your dishwasher or laundry late at night or early in the morning.
  • Home Batteries: Energy Storage Systems (ESS) can store electricity during off-peak hours and discharge it during peak hours. This means you’ll draw less from the grid when rates are high, leading to savings.
  • Smart Home Automation: Smart home systems can automatically manage your energy use, reducing consumption during peak hours.

Real-world Applications

Demand Response Programs

Some utilities offer demand response programs where you can earn financial incentives for reducing your consumption during peak demand periods. The utility will usually notify you in advance of an upcoming high-demand period and ask you to reduce usage.

Electric Vehicles

If you own an electric vehicle (EV), charging it during off-peak hours can be a significant cost saver. Advanced setups even allow your EV to discharge some of its stored energy back to the grid during peak hours, a concept known as Vehicle-to-Grid (V2G).

The Impact on Renewable Energy

Time-of-Use rates and peak shaving strategies also have environmental benefits. By reducing the need for inefficient peaker plants, which often run on fossil fuels, these strategies promote the use of renewable energy sources. Additionally, with the growing adoption of home solar installations, consumers can generate their own electricity during the day, store it, and use or sell it back during peak hours.

Potential Drawbacks

While Time-of-Use rates and peak shaving strategies offer financial benefits, they can be challenging to implement effectively. Here are some potential drawbacks:

  • Convenience: Not all activities can be conveniently shifted to off-peak hours.
  • Initial Costs: Installing home batteries or smart home systems can involve an upfront investment.
  • Complexity: Some people find ToU rates confusing and stressful, as they require constant vigilance to avoid peak rates.

Tips for Optimization

  1. Monitoring: Keep track of your electricity consumption patterns to understand when you’re using the most energy.
  2. Technology: Utilize energy management systems to automate your home’s energy use.
  3. Education: Make sure every member of the household understands ToU rates and peak shaving, so everyone can contribute to energy-saving strategies.


Time-of-Use rates and peak shaving can transform the way you consume electricity, offering opportunities for significant savings. By being smart about when and how you use energy, you can reduce your bills while also contributing to a more efficient and sustainable power grid. Although these strategies come with their set of challenges and require an initial time and financial investment, the long-term benefits are compelling both for your pocketbook and the planet.

This article is brought to you by Momentum Electrical Contractors

Specializing in installing hybrid systems that offer multiple forms of generation and smart grid management, Oakland-based Momentum Electrical Contractors are at the forefront of these transformational changes. Their expertise ensures that new residential projects not only meet but exceed the sustainability and resilience expectations of East Bay communities. For all your Oakland electrician needs, Momentum Electrical Contractors is happy to speak to you today!

What Our Clients Say

They were fabulous with their work and communication. We used them on a commercial project for our electronic lockers and it went very smoothly. Thanks so much!

Jacob M.

I am very impressed with Tom and his crew. They’re responsive, reliable, and do top quality work.

Jeff P.

We hired Momentum to help with installing an electric wall oven. These guys are remarkably professional; and they take customer satisfaction very seriously.

Ki V.

Momentum offered a reasonable price, accommodated our tight timing and executed the project seamlessly. The project had many unexpected issues and they solved all of them in a short period of time.

Dan S.

Momentum’s work was done efficiently and professionally at a reasonable price. Will definitely use them for future projects if anything comes up.

Stephanie M.

Highly recommend!! Exceptional service and price. Tom was very helpful, a really nice straight forward guy who definitely cares about his clients.

Amy R.